Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying
CA 2503835 C · Owner: Bilobrov, Sergiy · Inventors: Bilobrov, Sergiy; Lesperance, Jason A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copying of visual images by electronic devices is discouraged by metamerically altering the relative weights of the color components forming the visual images in a manner that is not perceptible to the human eye (70) but which is perceptible in the copy (90). In a preferred technique the visual images are , represented by more than three primary color components whose relative values are varied in this manner. A primary application is to discourage copying by video cameras of movies displayed on theater movie screens by causing the , copies to contain unacceptable spatial or temporal variations in colors perceived by the human eye (70).
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 27, 2003 and granted December 31, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 27, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2025.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.